Advertisements
Advertisements
प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
Advertisements
उत्तर
this criteria is shown by atoms of any matter which may exist alone (like helium) or may not exist alone and exist in molecular form (like oxygen/o₂ )
APPEARS IN
संबंधित प्रश्न
Intermolecular space is maximum in .......... less in ............ and the least in .........
What are molecules ?
Name one solid, one liquid and one gaseous non-metal.
Name two solid, two liquid and two gaseous elements at the room temperature.
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
Name a metal which has no fixed shape.
State whether colloidal solutions are homogeneous or heterogeneous.
Choose the correct answer.
A 5 per cent sugar solution means that :
What is meant by a solution?
What is a colloid ? Give two examples of colloids (or colloidal solutions)
What is the difference between colloids and suspensions ?
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
Name the process which can be used to purify an impure sample of copper sulphate.
Write a method to separate a mixture of sand and potash alum.
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
The particles in the matter are extremely small and can be seen even with a powerful microscope.
A teabag placed in a cup of hot water will diffuse into the water.
